Setting a public endpoint for each server which is behind a load balancer

Question

Given that there are a load balancer(e.g. AWS ELB) and multiple server instances associated to the load balancer, can I set up a public endpoint (e.g. NAT forwarding) for each server instance as well? I need this for a mobile client reconnects to the same server after the IP address of the client is changed by Wifi to Cellular Network handover.

With stateless servers (e.g. Web servers) and memory cache (e.g. Redis), my question is needless, however, I am using stateful servers (e.g. Socket servers).

Answer 1

I found the answer:

In AWS, the public address is already exposed when I create an EC2 instance. Just adding a Security Group with adding port numbers to Inbound is the only necessity.